<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" showIcon :closable="false" />
      <!-- 选择商品分类 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <el-cascader
            ref="cascader"
            v-model="selectedKeys"
            :options="catelist"
            :props="cascaderProps"
            @change="getParamsData"
          />
        </el-col>
      </el-row>
      <!-- tab标签页 -->
      <el-row>
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
          <el-tab-pane label="动态参数" name="many">
            <el-button
              type="primary"
              :disabled="isBtnDisabled"
              @click="addDialogVisible = true"
            >添加参数</el-button>
            <el-table :data="tableData" stripe border>
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <el-tag
                    v-for="(item, index) in scope.row.attr_vals"
                    :key="index"
                    closable
                    @close="removeTag(scope.row,index)"
                  >{{item}}</el-tag>
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  ></el-input>
                  <el-button
                    v-else
                    class="button-new-tag"
                    size="small"
                    @click="showInput(scope.row)"
                  >+ New Tag</el-button>
                </template>
              </el-table-column>
              <el-table-column type="index"></el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button
                    type="primary"
                    icon="el-icon-edit"
                    size="mini"
                    @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button>
                  <el-button
                    type="danger"
                    icon="el-icon-delete"
                    size="mini"
                    @click="removeParams(scope.row.attr_id)"
                  >删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
          <el-tab-pane label="静态属性" name="only">
            <el-button
              type="primary"
              :disabled="isBtnDisabled"
              @click="addDialogVisible = true"
            >添加属性</el-button>
            <el-table :data="tableData" stripe border>
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <el-tag
                    v-for="(item, index) in scope.row.attr_vals"
                    :key="index"
                    closable
                    @close="removeTag(scope.row,index)"
                  >{{item}}</el-tag>
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  ></el-input>
                  <el-button
                    v-else
                    class="button-new-tag"
                    size="small"
                    @click="showInput(scope.row)"
                  >+ New Tag</el-button>
                </template>
              </el-table-column>
              <el-table-column type="index"></el-table-column>
              <el-table-column label="属性名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button
                    type="primary"
                    icon="el-icon-edit"
                    size="mini"
                    @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button>
                  <el-button
                    type="danger"
                    icon="el-icon-delete"
                    size="mini"
                    @click="removeParams(scope.row.attr_id)"
                  >删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
        </el-tabs>
      </el-row>
    </el-card>
    <!-- Dialog -->
    <el-dialog
      :title="'添加' + this.titleText"
      :visible.sync="addDialogVisible"
      width="70%"
      @close="addDialogClosed"
    >
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="this.titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <!-- 底部按钮 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <el-dialog
      :title="'修改' + this.titleText"
      :visible.sync="editDialogVisible"
      width="70%"
      @close="editDialogClosed"
    >
      <el-form :model="editForm" :rules="addFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="this.titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <!-- 底部按钮 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      catelist: [],
      tableData: [],
      // 级联选择框配置
      selectedKeys: [],
      cascaderProps: {
        expandTrigger: 'hover',
        checkStrictly: true,
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 标签页
      activeName: 'many',
      // 对话框
      addDialogVisible: false,
      editDialogVisible: false,
      // 表单
      addForm: {
        attr_name: ''
      },
      editForm: {},
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.message.error('获取商品分类失败')
      }
      this.catelist = res.data
    },
    // 级联选择改变获取参数列表数据
    async getParamsData() {
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = []
        this.tableData = []
      }
      this.$refs.cascader.dropDownVisible = false
      // 根据所选项的id获取数据
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName }
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        item.inputValue = ''
      })
      this.tableData = res.data
    },
    // 点击tab页签再次请求参数列表数据
    handleTabClick() {
      this.getParamsData()
    },
    // 对话框
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    async showEditDialog(attrId) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attrId}`,
        {
          params: { attr_sel: this.activeName }
        }
      )
      if (res.meta.status !== 200) {
        return this.message.error('获取参数信息失败')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return false
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 201) {
          return this.$message.error('添加' + this.titleText + '失败')
        }
        this.$message.success('添加' + this.titleText + '成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return false
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('修改' + this.titleText + '失败')
        }
        this.$message.success('修改' + this.titleText + '成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    removeParams(attrId) {
      this.$confirm(
        '此操作将永久删除该' + this.titleText + ', 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      )
        .then(async () => {
          const { data: res } = await this.$http.delete(
            `categories/${this.cateId}/attributes/${attrId}`
          )
          if (res.meta.status !== 200) {
            return this.$message.error('删除失败')
          }
          this.$message.success('删除成功')
          this.getParamsData()
        })
        .catch(() => {
          this.$message.info('已取消删除')
        })
    },
    // 动态标签
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('修改标签失败')
      }
      this.$message.success('修改标签成功')
    },
    showInput(row) {
      row.inputVisible = true
      // 获得焦点
      this.$nextTick(_ => {
        // $nextTick方法，当页面上元素重新渲染后才会调用
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    handleInputConfirm(row) {
      row.inputValue = row.inputValue.trim()
      if (row.inputValue !== '') {
        row.attr_vals.push(row.inputValue)
        this.saveAttrVals(row)
        row.inputValue = ''
      }
      row.inputVisible = false
    },
    removeTag(row, index) {
      row.attr_vals.splice(index, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    isBtnDisabled() {
      if (this.selectedKeys.length !== 3) {
        return true
      }
      return false
    },
    cateId() {
      if (this.selectedKeys.length === 3) {
        return this.selectedKeys[2]
      }
      return null
    },
    titleText() {
      return this.activeName === 'many' ? '动态参数' : '静态属性'
    }
  },
  created() {
    this.getCateList()
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin-right: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>
